he consults on homicides around the u.s. and thanks for coming back to join us. that's interesting that selling bushmaster, calling it a watershed moment. you say we have to look at the mass killings as a social phenomenon. >> yeah. i think it's easy to target the gun issue. and the gun issue is vulnerable. but i think only from one vantage point. and that is, if you take assault, high-capacity, high-rapid fire weapons and take them out of the equation. and look at all the mass shootings that happened this year, we see this is happening with greater frequency than ever before. what i'm telling you is, we're dealing with a population, the mass killer. one of the things that distinguishes that person is, once he decides he's going to do it, he's going to do it. if you can keep an assault rifle out of his hands, the body count will drop. and that's great. but the mass killings will continue to happen unless systemically we address it as a social phenomenon. and recognize there's things that promote it. for example, his picture on our screen and us even caring to go